imagepng
(PHP 4, PHP 5, PHP 7)
imagepng — Output a PNG image to either the browser or a file
Description
$image
[, mixed $to
= NULL
[, int $quality
= -1
[, int $filters
= -1
]]] ) : bool
Outputs or saves a PNG image from the given
image
.
Parameters
-
image
-
An image resource, returned by one of the image creation functions, such as imagecreatetruecolor().
-
to
-
The path or an open stream resource (which is automatically being closed after this function returns) to save the file to. If not set or
NULL
, the raw image stream will be outputted directly.Note:
NULL
is invalid if thequality
andfilters
arguments are not used. -
quality
-
Compression level: from 0 (no compression) to 9. The default (-1) uses the zlib compression default. For more information see the » zlib manual.
-
filters
-
Allows reducing the PNG file size. It is a bitmask field which may be set to any combination of the PNG_FILTER_XXX constants.
PNG_NO_FILTER
orPNG_ALL_FILTERS
may also be used to respectively disable or activate all filters. The default value (-1) disables filtering.CautionThe
filters
parameter is ignored by system libgd.
Return Values
Returns TRUE
on success or FALSE
on failure.
However, if libgd fails to output the image, this function returns TRUE
.
Changelog
Version | Description |
---|---|
5.4.0 |
Added support for passing a stream resource to
to .
|
5.1.3 |
Added the filters parameter.
|
5.1.2 |
Added the quality parameter.
|
Examples
<?php
$im = imagecreatefrompng("test.png");
header('Content-Type: image/png');
imagepng($im);
imagedestroy($im);
?>
See Also
- imagegif() - Output image to browser or file
- imagewbmp() - Output image to browser or file
- imagejpeg() - Output image to browser or file
- imagetypes() - Return the image types supported by this PHP build
- imagesavealpha() - Whether to retain full alpha channel information when saving PNG images
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Document created the 30/01/2003, last modified the 26/10/2018
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References
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